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15 September, 21:32

Team X can set up chairs in the gym in 15 minutes and team Y can set up the chairs in 20 minutes. How much time would they take, working together, to set up the same chairs?

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  1. 15 September, 22:00
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    Team X : 1min - - > 1/15 chairs

    Team Y : 1min - - > 1/20 chairs

    Team X&Y : 1min - - > 1/15 + 1/20 = 7/60 chairs

    X min - - > 60/60 chairs

    X = 60/7 min
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